Position sensing circuit and position control device with differential sensing structure

2. The position sensing circuit of claim 1, further comprising a position controller configured to control a position of the conductor based on the position value.

5. The position sensing circuit of claim 1, wherein the amplitude detection circuit comprises one of an amplitude demodulator and a frequency down conversion mixer.

7. The position sensing circuit of claim 6, wherein the operation circuit is configured to calculate the position value (PV) according to PV=(VOP−VON)/(VOP+VON), where VOP is the digital first amplitude and VON is the digital second amplitude.

8. The position sensing circuit of claim 1, further comprising a calibration circuit configured to correct a variation of a corresponding value by monitoring a variation of at least one of inductance, capacitance, and resistance of the differential sensing coil unit.

10. The position control device of claim 9, further comprising a position controller configured to control a position of the conductor based on the position value.

13. The position control device of claim 9, wherein the amplitude detection circuit comprises one of an amplitude modulator and a frequency down conversion mixer.

15. The position control device of claim 14, wherein the operation circuit is configured to calculate the position value (PV) according to PV=(VOP−VON)/(VOP+VON), where VOP the digital first amplitude and VON is the digital second amplitude.

16. The position control device of claim 9, further comprising a calibration circuit configured to correct a variation of a corresponding value by monitoring a variation of at least one of an inductance, a capacitance, and a resistance of the differential sensing coil unit.

18. The camera module of claim 17, wherein the circuitry is configured to generate a first oscillation signal having a first amplitude based on the first inductance, to generate a second oscillation signal having a second amplitude based on the second inductance, and to calculate the position value based on the first amplitude and the second amplitude.

19. The camera module of claim 17, wherein the first inductor and the second inductor are connected to a common connection node and the connection node is grounded.

20. The camera module of claim 17, wherein the first inductor and the second inductor are spaced apart from each other along a direction that is orthogonal to a direction along which the first inductor and the second inductor face the conductor.